Add cfg(feature = "avro") attribute to Avro example in SQL API docs (apache#17142)

* docs: add feature flag for Avro support in SQL API example

* docs: update code block syntax for memory allocator example in crate configuration

* docs: update code block syntax for CSV example in UDFs documentation

* chore(deps): add snmalloc-rs dependency version 0.3

* fix(docs): update Avro example to conditionally compile and remove empty code block

* feat(ci): add snmalloc build dependencies installation to workflows

* feat(ci): add installation of cmake system build dependencies in workflows

* fix(docs): correct formatting of Avro example code block in SQL API documentation

* Restore main's dependencies, ci workflow

* fix: update code block to ignore execution requiring snmalloc in crate-configuration.md

* revert md block to no-run

* revert block text to csv

Author: kosiew

docs/source/library-user-guide/using-the-sql-api.md

@@ -119,6 +119,8 @@ async fn main() -> Result<()> {
 DataFusion can also read Avro files using the `register_avro` method.
 
 ```rust
+# #[cfg(feature = "avro")]
+{
 use datafusion::arrow::util::pretty;
 use datafusion::error::Result;
 use datafusion::prelude::*;
@@ -154,6 +156,7 @@ async fn main() -> Result<()> {
     );
     Ok(())
 }
+}
 ```
 
 ## Reading Multiple Files as a table